FileUpload控制元件上傳圖片到資料庫
ASP儲存圖片並顯到網頁例項
2010-09-15 22:52:32| 分類： .NET |字號 訂閱
using System.IO;
using System.Drawing;
儲存圖片：
前臺：
將 form的enctype屬性改為：
<form id="form1" runat="server" enctype="multipart/form-data">
後臺：
protected void btnsaveiamge_Click(object sender, EventArgs e)
{
string getname = TextBox2.Text;
if (fil1.HasFile) //判斷是否選種檔案
{
string getfile = fil1.PostedFile.FileName;
string imgtype = fil1.PostedFile.ContentType; //檔案型別
int i = getfile.LastIndexOf(".");
string filename;
filename = getfile.ToLower().Substring(i, getfile.Length - i);
if (!(filename == ".jpg" || filename == ".jpeg" || filename == ".gif" || filename
== ".png"))
{
ClientScript.RegisterStartupScript(ClientScript.GetType(), "uploaderr",
"<script language='javascript' defer>alert('上傳檔案格式不正確')</script>");
return;
}
//上傳檔案
//FileUploadCompant(this.FileUpload1);
string strpath = fil1.PostedFile.FileName; //檔名
byte[] getimage = new byte[fil1.PostedFile.ContentLength]; //將圖片轉為二進位制檔案
ContentLength表示上傳檔案的長度
Stream filestream = fil1.PostedFile.InputStream;
//讀取資料
filestream.Read(getimage, 0, fil1.PostedFile.ContentLength);
strcon = "Data Source=(local); DataBase=NorthWind; UID=sa; PWD=200402025";
testcon = new SqlConnection(strcon);
testcon.Open();
//用引數的方式儲存二進位制圖片到資料庫
SqlCommand command = new SqlCommand("INSERT INTO ImageStore
(imgtitle,imgtype,imgdata,IMPATH)VALUES ( @imgtitle, @imgtype,@imgdata,@impath)", testcon);
SqlParameter paretile = new SqlParameter("@imgtitle", SqlDbType.VarChar, 50);
paretile.Value = getname;
command.Parameters.Add(paretile);
SqlParameter paretype = new SqlParameter("@imgtype", SqlDbType.VarChar, 50);
paretype.Value = imgtype;
command.Parameters.Add(paretype);
SqlParameter pareimgdata = new SqlParameter("@imgdata", SqlDbType.Image);
pareimgdata.Value = getimage;
command.Parameters.Add(pareimgdata);
SqlParameter pareimgpath = new SqlParameter("@impath", SqlDbType.VarChar, 200);
pareimgpath.Value = strpath;
command.Parameters.Add(pareimgpath);
int iresult = command.ExecuteNonQuery();
testcon.Close();
}
}
顯示圖片：
新增（*.ashx）檔案
在檔案下編輯
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Data;
using System.Data.SqlClient;
namespace MiSTest
{
/// <summary>
/// LoadImage 的摘要說明
/// </summary>
public class LoadImage : IHttpHandler
{
private SqlConnection testcon;
private SqlCommand testcmd;
string strsql;
public void ProcessRequest(HttpContext context)
{
//context.Response.ContentType = "text/plain";
//context.Response.Write("Hello World");
try
{
string id = context.Request.QueryString["id"];
if (!string.IsNullOrEmpty(id))
{
string strcon="Data Source=(local); DataBase=NorthWind; UID=sa;
PWD=200402025";
testcon = new SqlConnection(strcon);
testcon.Open();
testcmd = new SqlCommand();
testcmd.Connection = testcon;
testcmd.CommandType = CommandType.Text;
strsql = "Select * from ImageStore where id="+ id + ""; //根據條件查出對應的
圖片
testcmd.CommandText = strsql;
SqlDataReader sdr = testcmd.ExecuteReader();
if (sdr.Read())
{
context.Response.ContentType = sdr["IMGTYPE"].ToString(); //獲取圖片型別
context.Response.BinaryWrite((byte[])sdr["IMGDATA"]); //顯示圖片必須
BinaryWrite這種寫入的方式
}
testcon.Close();
}
}
catch (Exception err)
{
context.Response.Write("<script language='javascript' defer='defer'> alert('" +
err.Message + "')</script>");
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
在頁面中顯示圖片
protected void Button3_Click(object sender, EventArgs e)
{
Image1.ImageUrl = "LoadImage.ashx?id=" + txtimageid.Text.Trim() +""; //圖片地址指向ashx
檔案並向傳遞數片編號
}